ScienceDaily: Astronomy News |
- NASA's GRAIL mission puts a new face on the moon
- It's complicated: Dawn spacecraft spurs rewrite of asteroid Vesta's story
- Black holes don't make a big splash
| NASA's GRAIL mission puts a new face on the moon Posted: 08 Nov 2013 06:17 AM PST Scientists using data from the lunar-orbiting twins of NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission are gaining new insight into how the face of the moon received its rugged good looks. |
| It's complicated: Dawn spacecraft spurs rewrite of asteroid Vesta's story Posted: 08 Nov 2013 06:13 AM PST Just when scientists thought they had a tidy theory for how the giant asteroid Vesta formed, a new paper from NASA's Dawn mission suggests the history is more complicated. If Vesta's formation had followed the script for the formation of rocky planets like our own, heat from the interior would have created distinct, separated layers of rock (generally, a core, mantle and crust). In that story, the mineral olivine should concentrate in the mantle. However, that's not what Dawn's visible and infrared mapping spectrometer (VIR) instrument found. |
| Black holes don't make a big splash Posted: 08 Nov 2013 06:10 AM PST Throughout our universe, tucked inside galaxies far, far away, giant black holes are pairing up and merging. As the massive bodies dance around each other in close embraces, they send out gravitational waves that ripple space and time themselves, even as the waves pass right through our planet Earth. Scientists know these waves, predicted by Albert Einstein's theory of relativity, exist but have yet to directly detect one. In the race to catch the waves, one strategy -- called pulsar-timing arrays -- has reached a milestone not through detecting any gravitational waves, but in revealing new information about the frequency and strength of black hole mergers. |
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